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Table 4 Independent risk factors for cesarean delivery among nulliparous women undergoing induction of labor at term

From: Nomogram predicting cesarean delivery undergoing induction of labor among high-risk nulliparous women at term: a retrospective study

Characteristics

Unadjusted OR (95%CI)

P

Adjusted OR (95%CI)

P

Maternal age (y)

1.11 (1.07-1.14)

<0.001

1.09(1.05-1.13)

<0.001

Height (cm)

0.92(0.90-0.95)

<0.001

0.91 (0.88-0.93)

<0.001

Uterine height (cm)

1.17 (1.11-1.22)

<0.001

1.07 (1.00-1.13)

0.038

Abdominal circumference (cm)

1.07 (1.05-1.08)

<0.001

1.05 (1.03-1.08)

<0.001

Estimated fetal weight (100 g)

1.14 (1.09-1.19)

<0.001

1.06 (1.01-1.12)

0.013

Initial station

 

<0.001

 

<0.001

 -1 or 0 (2 points)

Ref

 

Ref

 

 -2 (1 points)

1.58 (0.57-4.40)

 

1.26(0.44-3.62)

 

 -3 (0 points)

2.97 (1.06-8.32)

 

1.96(0.68-5.68)

 

Initial cervical effacement (%)

 

<0.001

 

0.046

 ≥ 80 (3 points)

Ref

 

Ref

 

 60-70 (2 points)

2.59 (1.43-4.70)

 

1.79 (0.97-3.31)

 

 40-50 (1 points)

3.63 (1.94-6.78)

 

2.19 (1.14-4.21)

 

 0-30 (0 points)

26.00 (3.96-170.64)

 

9.23 (1.26-67.56)

 

Initial cervical consistency

 

<0.001

 

0.006

 Soft (2 points)

Ref

 

Ref

 

 Firm (0 points)

2.26 (1.07-4.80)

 

2.33 (1.06-5.11)

 

 Medium (1 points)

1.67 (1.34-2.09)

 

1.45 (1.14-1.83)

 

Indications for induction of labor

 

<0.001

 

<0.001

 PROM

Ref

 

Ref

 

 Late term (41 weeks or greater)

1.76 (1.36-2.28)

 

1.58 (1.20-2.08)

 

 Diabetes mellitus

1.35 (0.99-1.86)

 

1.03 (0.73-1.44)

 

 Hypertensive disorder of pregnancy

3.42 (2.05-5.72)

 

2.38 (1.38-4.13)

 

 Others

1.18 (0.80-1.75)

 

1.22 (0.81-1.85)

 
  1. PROM Premature rupture of membrane, OR Odds ratio